WPF架构关键技术剖析(3)--做自己的交互Action(3)

1)测试数据准备：

//这是我学习treeview绑定时用的，也随带给不是很会用treeview绑定的网友们一个例子.

A)层级类，树形结构.

public class Folder

{

public ObservableCollection<Folder> Children { get; set; }

public string A { get; set; }

public string B { get; set; }

}

B) 一个简单的ViewModel

public class MainViewModel : ViewModelBase

{

public string Welcome

{

get

{

return "Welcome to MVVM Light";

}

}

/// <summary>

/// Initializes a new instance of the MainViewModel class.

/// </summary>

public MainViewModel()

{

if (IsInDesignMode)

{

// Code runs in Blend --> create design time data.

}

else

{

LoadData();

// Code runs "for real"

}

}

public void LoadData()

{

ObservableCollection<Folder> theFolders = new ObservableCollection<Folder>();

Folder theFolder = new Folder()

{

A = "A",

B = "1001",

Children = new ObservableCollection<Folder>() {

new Folder(){A="B1",B="101",Children= new ObservableCollection<Folder>(){

new Folder(){A="C1",B="10101"},

new Folder(){A="C2",B="10102"},

}},

new Folder(){A="B2",B="102",Children= new ObservableCollection<Folder>(){

new Folder(){A="C3",B="10201"},

new Folder(){A="C4",B="10202"},

}},

new Folder(){A="B3",B="103"},

new Folder(){A="B4",B="104"},

}

};

theFolders.Add(theFolder);

theFolder = new Folder()

{

A = "B",

B = "20",

Children = new ObservableCollection<Folder>() {

new Folder(){A="B4",B="201",Children= new ObservableCollection<Folder>(){

new Folder(){A="C1",B="20101"},

new Folder(){A="C2",B="20102"},

}},

new Folder(){A="B5",B="202",Children= new ObservableCollection<Folder>(){

new Folder(){A="C3",B="20201"},

new Folder(){A="C4",B="20202"},

}},

new Folder(){A="B6",B="203"},

new Folder(){A="B7",B="204"},

}

};

theFolders.Add(theFolder);

this.Folders = theFolders;

}

private ObservableCollection<Folder> _Folders;

public ObservableCollection<Folder> Folders

{

get

{

return _Folders;

}

set

{

if (_Folders != value)

{

_Folders = value;

RaisePropertyChanged("Folders");

}

}

}

////public override void Cleanup()

////{

//// // Clean up if needed

//// base.Cleanup();

////}

}

2)下面是页面:

<UserControl x:Class="MvvmLight1.MainPage"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

xmlns:local="clr-namespace:MvvmLight1" <!-- 这里是定义命名空间-->

mc:Ignorable="d"

Height="300"

Width="300"

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"

xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"

DataContext="{Binding Main, Source={StaticResource Locator}}"

xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk">

<UserControl.Resources>

<!-- TreeView的模板-->

<sdk:HierarchicalDataTemplate x:Key="FolderTemplate" ItemsSource="{Binding Children}">

<Grid>

<Grid.ColumnDefinitions>

<ColumnDefinition Width="0.3*"></ColumnDefinition>

<ColumnDefinition Width="0.7*"></ColumnDefinition>

</Grid.ColumnDefinitions>

<TextBlock Grid.Column="0" Text="{Binding Path=A}"></TextBlock>

<TextBox Grid.Column="1" Text="{Binding Path=B}"></TextBox>

</Grid>

</sdk:HierarchicalDataTemplate>

</UserControl.Resources>

<Grid x:Name="LayoutRoot">

<TextBlock FontSize="36"

FontWeight="Bold"

Foreground="Purple"

Text="{Binding Welcome}"

VerticalAlignment="Center"

HorizontalAlignment="Center"

TextWrapping="Wrap" />

<sdk:TreeView ItemsSource="{Binding Path=Folders}" ItemTemplate="{StaticResource FolderTemplate}" HorizontalAlignment="Stretch" Margin="0,0,0,0" Name="treeView1" VerticalAlignment="Stretch" SelectedItemChanged="treeView1_SelectedItemChanged" >

<!--<i:Interaction.Behaviors> 这里是用微软的behavior做.

<local:MyBehavior Params="hello,tian" TargetName="treeView1" MethodName="TreeViewSelected" />

</i:Interaction.Behaviors>-->

<!-- 这里是用我们刚才定义的Action框架实现交互TreeViewSelected选择方法定义在本页的.cs中见后面的代码,注意myactiontest的参数，这些参数在解析过程中最终会变成对应属性的值..-->

<local:WPFTestDettach.MyObjects>

<local:MyActionTest EventName="SelectedItemChanged" Params="hello,1" TargetName="" MethodName="TreeViewSelected" MyName="xxx1"></local:MyActionTest>

<local:MyActionTest EventName="SelectedItemChanged" Params="hello,2" TargetName="" MethodName="TreeViewSelected" MyName="xxx2"></local:MyActionTest>

<local:MyActionTest EventName="SelectedItemChanged" Params="hello,3" TargetName="" MethodName="TreeViewSelected" MyName="xxx3"></local:MyActionTest>

<local:MyActionTest EventName="SelectedItemChanged" Params="hello,4" TargetName="" MethodName="TreeViewSelected" MyName="xxx4"></local:MyActionTest>

</local:WPFTestDettach.MyObjects>

</sdk:TreeView>

</Grid>

</UserControl>

3)xaml.cs

public partial class MainPage : UserControl

{

public MainPage()

{

InitializeComponent();

} public void TreeViewSelected(string Params)

{

MessageBox.Show(Params);

}

}

4)我利用微软的behaviors实现，MyBehavior 继承自Behavior<>,大家可以对比一下,很多代码都比较类似.

public class MyBehavior : Behavior<TreeView>

{

protected override void OnAttached()

{

base.OnAttached();

this.AssociatedObject.SelectedItemChanged += new RoutedPropertyChangedEventHandler<object>(AssociatedObject_SelectedItemChanged);

}

void AssociatedObject_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)

{

DoSomething(Params);

}

protected override void OnDetaching()

{

base.OnDetaching();

this.AssociatedObject.SelectedItemChanged -= new RoutedPropertyChangedEventHandler<object>(AssociatedObject_SelectedItemChanged);

}

public string Params { get; set; }

public string TargetName { get; set; }

public string MethodName { get; set; }

public void DoSomething(string PMs)

{

object theRootObj = GetRootObject(this.AssociatedObject);

object theTargetObj = null;

if (TargetName == "")

{

theTargetObj = theRootObj;

}

else

{

theTargetObj = ((FrameworkElement)theRootObj).FindName(TargetName);

}

MyActionCollection theValue = (MyActionCollection)((DependencyObject)theTargetObj).GetValue(WPFTestDettach.MyObjectsProperty);

foreach (var item in theValue)

{

string a = item.MyName;

}

MethodInfo[] theMIs = theTargetObj.GetType().GetMethods();

MethodInfo theMI = theTargetObj.GetType().GetMethod(MethodName,BindingFlags.NonPublic);

if (theMI != null)

{

theMI.Invoke(theTargetObj, null);

}

}

private FrameworkElement GetRootObject(FrameworkElement obj)

{

if (obj.Parent != null && obj.Parent is FrameworkElement)

{

return GetRootObject((FrameworkElement)(obj.Parent));

}

return obj;

}

}